The city of San Francisco has advised the homeowners of the troubled Millennium Tower to continue to wait until approval of a revised pile installation method before resuming the high-rise's foundation retrofit, paused after the installation of piles accelerated the settlement of the 645-ft-tall residential condominium. The 58-story tower, which remains occupied, has sunk a total of about 17 in. since its completion in 2008.
On Sept. 10, Patrick O’Riordan, the interim director of the San Francisco Dept. of Building Inspection, sent a letter to the Millennium Tower Association requesting that “in the interest of all involved,” the group “refrain from resuming” the pile foundation retrofit. O'Riordan advised the association to wait until the department and the city’s engineering design review team have reviewed the forthcoming updated construction approach for the pile and casings installation.